Optical Scanning Device and Printing Apparatus

A printing apparatus comprising:

• a photosensitive member;
• an optical scanning device which is activated in response to a print request, the optical scanning device comprising:
• an oscillating mirror which has a pair of electrodes and a mirror oscillator, and which deflects a light beam to be exposed on the photosensitive member;
• a driving unit which applies a wave-like driving signal to the pair of electrodes so as to oscillate the mirror oscillator by an electrostatic force corresponding to the driving signal;
• a detecting unit which detects an oscillation amplitude of the oscillating mirror;
• an adjusting unit which changes a value of at least one of a duty ratio, a driving frequency, an amplitude, and a bias voltage of the driving signal as a parameter so as to adjust the oscillation amplitude detected by the detecting unit to a target value;
• and
• a storing unit which stores the value of the parameter changed by the adjusting unit as a reference value,
• wherein when the oscillating mirror is activated, the adjusting unit starts the adjusting of the oscillation amplitude with using the driving signal based on the reference value stored in the storing unit;
• and
• a printing unit which forms an image on the exposed photosensitive member and transfer the image to a recording medium.

An optical scanning device comprising:

• an oscillating mirror which oscillates rotationally;
• a driving unit which applies a driving signal to the oscillating mirror to oscillate;
• a detecting unit which detects an oscillation amplitude of the oscillating mirror;
• a controller which controls a waveform of the driving signal to adjust the oscillation amplitude of the oscillating mirror to a target value based on a detection result of the detecting unit;
• a storing unit which stores a waveform data indicating the waveform of the driving signal which is obtained in the control by the controller, as a reference data;
• a receiving unit which receives a control start command and a control stop command,
• wherein, in response to the control start command, the controller starts controlling of the waveform of the driving signal to adjust the oscillation amplitude, based on the reference data stored in the storing unit.